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        <h4>时态</h4>
        <ul>
            <li>
                <span class="label">现在完成</span>
                <span class="content">The rabbit has eaten a carrot.</span>
            </li>
            <li>
                <span class="label">+情态</span>
                <span class="content">The rabbit may have eaten a carrot.</span>
            </li>
            <li>
                <span class="label">改时间+否定</span>
                <span class="content">The rabbit could not have eaten a carrot.</span>
            </li>
            <li>
                <span class="label">改为被动</span>
                <span class="content">The carrot could not have been eaten by the rabbit.</span>
            </li>
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